All kinds of style, a key set, easily know the result in advance, not restricted by any light source.

第九；各种玩法，一键设置，轻轻松松提前知道结果，不受任何光源的限制。

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The main source of illumination is called the key light. The key light is frequently supplemented by subsidiary lighting. The chief source of light for outdoor shooting is sunlight.

主要光源称为主光。主光常常用辅光作补充。室外拍摄的主光为阳光。

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The key parameters of projection display, including resolution, contrast, projection optics, optical throughput, color, light source and screen and their optimum method were described.

描述了投影显示关键参数（分辨率、对比度、投影光学、系统的光通量、彩色化、灯及屏幕）及优化方法。

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The key advantage for OLED is that the panel itself emits light, eliminating the need for a light source behind it and keeping the overall structure very thin and light.

WSJ: TV Makers Seek Fatter Profits in Thinner Sets